Lingering in a long line at the dry cleaners, a woman starts to ...

[fox]

Lingering in a long line at the dry cleaners, a woman starts to feel dizzy and tired with a quickly developing headache. Someone suggests that her symptoms might be from breathing something used in the shop.
 
  A substance that can cause such symptoms, and is commonly used in dry cleaning, is a A) heavy metal.
  B) halogenated hydrocarbon, PERC.
  C) radioactive hydrocarbon.
  D) safe and gentle natural compound.

Question 2

Define a fossil and list the ways that fossils form. Explain why fossils are usually found in sedimentary rocks rather than in igneous or metamorphic rocks.
 
  What will be an ideal response?

[ms_sulzle]

Answer to Question 1

B

Answer to Question 2

Fossils: remains of organisms preserved in rock. Fossils form as preserved remains of shelly organisms, replaced cellular material, or impressions. Igneous environments too hot for life if extrusive (although extremely rare occurrences of volcanic fossils exist), and there is no life in intrusive environments. Metamorphic processes alter sedimentary rocks and therefore any fossils. Sedimentary rocks are formed at the appropriate temperatures, pressures for life.